Ferromanganese oxides, as abundant minerals in natural waters and soils, would affect the transport and fate of vanadium(V) in the environment. The adsorption behaviour of V(V) on synthesized goethite and birnessite under environmental factors including pH, ionic strength, coexisting substances such as anions, cations, and fulvic acid (FA) was investigated by batch experiments. The results indicated that the kinetics model of V(V) adsorption on goethite and birnessite well fitted with pseudo-second-order, and the adsorption equilibrium was achieved in 60 min and 120 min, respectively. The V(V) adsorption isotherms for goethite and birnessite conformed to the Langmuir isotherm with maximum adsorption amount of 8.24 and 9.11 mg·g^–1, respectively. The higher V(V) adsorption capacity on goethite was observed at pH 4–8, while that on birnessite occurred at pH 2 owing to their different point of zero charge pH. The V(V) adsorption amounts of the synthesised materials were decreased with the increase in ionic strength of NaNO₃ but increased with the elevating FA concentration in solution. The inhibitory effect on V(V) adsorption was found in the presence of anions of PO₄³⁻ and SO₄²⁻, while cations like Ca²⁺ and Mg²⁺ facilitated the adsorption. The obtained results are of great importance to understand V(V) mobility in soil and aqueous environment.

中文翻译：

---

针铁矿和水钠锰矿对钒的吸附特性和行为

锰铁氧化物是天然水和土壤中的丰富矿物质，会影响环境中钒的运输和命运。通过分批实验研究了在pH，离子强度，共存物质（如阴离子，阳离子和黄腐酸）等环境因素下，V（V）在合成针铁矿和水钠锰矿上的吸附行为。结果表明，V（V）在针铁矿和水钠锰矿上的吸附动力学模型符合拟二级，分别在60min和120min时达到吸附平衡。针铁矿和水钠锰矿的V（V）吸附等温线符合Langmuir等温线，最大吸附量为8.24和9.11 mg·g ^–1， 分别。在pH值为4-8时，在针铁矿上具有更高的V（V）吸附容量，而在水钠锰矿上，由于它们的零电荷pH值不同，吸附容量更大。合成材料的V（V）吸附量随NaNO ₃离子强度的增加而降低，但随溶液中FA浓度的升高而增加。在PO ₄ ^3-和SO ₄ ^2-的阴离子存在下，对V（V）的吸附具有抑制作用，而Ca ²⁺和Mg ²⁺等阳离子则促进了吸附。获得的结果对于了解土壤和水环境中的V（V）迁移率非常重要。